RadioShack 22-510 Switching Power Supply Teardown
ID: 56444
Description: The RadioShack 22-510 Switching Power Supply...
Steps:
- Ensure the power supply is unplugged from mains power before continuing. If the device is powered on during disassembly, serious harm or death may occur.
- The entire power supply can be taken apart with a Phillips screwdriver and adjustable wrench.
- Removing the eight cover screws on either side of the power supply allows the cover to lift off
- Screws can be organized using an iFixit Magnetic Project Mat
- A fuse protects the system from overcurrent conditions and the chassis is grounded to protect the user from shorts to the case.
- The fan connector pulls out by hand. The spade terminal connectors may require coaxing with a pair of pliers.
- The Sunon MagLev KDE1205PFV2 runs at 4300 RPM for a maximum airflow of 13 CFM. A dirty fan might not meet these specifications. Remember to clean your fans!
- The illuminated switch is connected by two sets of black and white AC wires and held in by two locking tabs.
- The switch is hooked up to the primary side of the circuit. If the switch faults while energized, it has potential to shock the user.
- Removing the heatsink from the spreader reveals the liberal use of thermal paste. Try not to get it on your hands, it's tough to wash off!
- The silver heat spreader is screwed to the chassis and must be detached before removing the board.
- The board lifts out of the chassis after removing the five screws holding it down.
- The capacitors may still be charged, do not touch the terminals! The capacitors can be discharged by shorting the terminals with an insulated screwdriver.
- The UC3842BN PWM controller handles the switching feedback.
- The chassis has a sheet of plastic for short circuit prevention under the board.
- A thermally conductive pad lies under the heatsink assembly for additional cooling capability.
- Organized parts make reassembly a breeze.
